This research aims to understand the determinants of United States in deciding its foreign policy in Afghanistan regarding the postponement of withdrawal of US military in Afghanistan in 2014-2016. This US foreign policy began from the decision to deploy military to several countries including Afghanistan, but as time goes by, the withdrawal was imminent but postponed.The author uses the content analysis method by collecting information related to reference sources were taken from book, journals, and internet. This reserach shows that international factor is the most influential determinant in US foreign policy of military postponement of withdrawal. President Obama’s decision to postpone the withdrawal is driven by two factors, which are the security crisis in Afghanistan dan the influence from President Ashraf Ghani of Afghanistan in 2014. Therefore, the US military remained in Afghanistan until 2016.